2018 K League 2
The 2018 K League 2 was the sixth season of the K [League 2], the second-highest division in the South Korean football league system.
Asan Mugunghwa once again grabbed an opportunity for promotion by winning its second K League 2 title, but its owner Korean Police Agency did not recruit new players who could meet clubs' requisite for maintenance before the end of the season. Asan Mugunghwa, which was in the process of being dissolved, was finally disqualified from promoting.
Runners-up Seongnam FC directly qualified for the K League 1 instead of Asan Mugunghwa, and the third, fourth, and fifth-placed team advanced to the promotion playoffs.
Teams
Team changes
Relegated from 2017 [K League Classic|K League Classic]Promoted to K League 1
Personnel and sponsoring
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.| Team | Managers | Kit manufacturer | Main sponsor | |||||
| Ansan Greeners |  Foreign playersRestricting the number of foreign players strictly to four per team, including a slot for a player from AFC countries. A team could use four foreign players on the field each game.As of 24 July 2018.
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